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Microsoft has released Virtual PC 2007 for Windows and it continues to be free of charge. You should upgrade Virtual PC 2004 to
Virtual PC 2007 Service Pack 1 to take advantage of the virtualization program fixes and other changes.
Windows 7 users that have the XP mode feature should install available security and program fixes for the built-in virtualization software, in case the mouse will not work properly in a guest system.
The support of Microsoft Virtual PC for Mac has been discontinued which means you should consider replacing the virtualization program. Take a look at VMware desktop software or the freeware VirtualBox virtualization software for Mac, Windows and Linux systems.
Note that you can always try to reinstall or update the Virtual PC Additions if you have a problem using any features that the Virtual PC Additions should support or add. Reinstalling Virtual PC Additions is done by simply launching the guest operating system and then choosing the Action menu and then click Install or Update Virtual Machine Additions. Reboot the guest operating system when prompted.
Image credit: Screenshot taken by the author.